Magnifying and illuminating device



Jan.4,1938. QJNES I 2,104,198

MAGNIFYING AND ILLUMINATING DEVICE Filed Nov. 18, 1935 2 Sheets-Sheet 1 INVENTOR Y CLEVOE JONES BY WW mumwwup ATTORNEYS Jan. 4, 1938. c. JONES 2,104,198

MAGNIFYING AND ILLUMINATING DEVICE Filed Nov. 18, 1935 -2 Sheets-Sheet 2 INVENTOR CLEVOE JONES V go electric light Patented Jan.14,l 938 "UNITED. STATES PATENT OFFICE Mich a. corporation of Michigan Company, Detroit,

Applicationl N'ovembcr 18, 1935, Serial No. 50.454

' 9 Claims. (on 240-2) The invention relates to apparatus of that type in which a magnifying lens is associated with an electric light so as to give an enlarged vision of the illuminated part. It is the object of the present invention. to simplify the construction and to facilitate the use of the same, and to this end, the invention consists in the construction as hereinafter set forth. In the drawings: 4

Figure 1 is a perspective view of the device; Figure 2 is a sectional side elevation thereof; Figure 3 is anenlarged section on line 8-3 of Figure 2;

Figure 4 is a section on line H of Figure 2; Figure 5 is a section on line 5-5 of Figure 2. V In general structure, my improved instrument comprises a standard suchas that of a dental engine to which is attached a jointed arm can rying at its outer, end a magnifying glass and an various positions. One difliculty encountered with such a structure is the supplying of electric current to the light in its various positions of ad- 'justment without entanglement of the electrical g5 conductors used for this purpose. Thus, the

associated therewith adjustable into operator must frequently shift the light from one side to another'of the lens, as well as changing the angle of its axis or direction in which the light is projected. With my improved construc- 30 ,tion, this dlfllculty is avoided; first, by placing the electrical conductor within the jointed arm W on which the lens is mounted, also, by mounting the lens and the lamp on a common frame which I is rotatably secured within" asupporting frame, and supplying current to the lamp through an annular conductor movable therewith and engaging a stationary brush. Thus, the lamp and lens maybe 'adjusted'to any"v angular position asjdesired without entanglement of the current o conductors.

In detail, A is a suitable standard such as that used for supporting the mechanism of ,a dental engine. upper end of the standardA and forming a 5swivelling support for a laterally extending tubular arm C. This preferably has a telescopic section D which permits of extending the length thereof, and a plurality of jointed sectionsE, E. The latter are connected to the arm D and to 50 each other by outer section E is connected by'a universal joint G with an annular frame H. Within the'frame H is rotatably secured. a second-annular frame I in which the lens J is mounted. At one point 5 inthe frame I is a laterally projecting post K Bis a hollow casing mounted at the the one engaging an annular groove in the other.

universal joints F F, and the r forming the mounting fonthe lamp casing which is secured to said post by a universal joint M. The lamp casing L is provided with an electric bulb N and is of any suitable construction for projecting a beam of light therefrom. At 5 the rear end of the casing L is a switch 0 for controlling the turning on or off of the light.

Where alternating electric current is available, I arrange within the hollow casing B a transformer P through which a commercial current such for instance as 110 volts is transformed to a relatively low voltage suitable for the bulb N. The primary conductors Q for this transformer are coupled by a suitable plug Q with a source of current (not shown). The secondary circuit has one terminal R, grounded on the casing B, while the other terminal is connected to an insulated conductor R extending longitudinally through the hollow arm. This conductor R has a coiled portion 1'1. permitting of the extension of the telescopic section D and also has portions R passing through each of the universal joints. As shown in Figure 5, the universal joint F has a ball member-F and a split socket member F respectively connected to the members D and E. The portion R of the conductor R is preferably surrounded with a resilient helical armored coil R and this after passing out from the ball I? has a loop portion R connecting the same to the portion which passes axially through the socket F into the portion E. A similar construction is employed at each of the universal joints F'and G, so'that the jointed-sections may be turned to different angular positions with a comparatively slight flexing of the conductor.

or rabbet'ed cross-section and are held in rotative engagement with each other by balls or pins in As shown in Figure. 4, the frame H has ;a plural-v ity of radial bores therein which are normally closed by screw threaded plugs H. but which permit of the insertion of balls H so as to partly,

engage an annular'groove I in the frame I.

These balls will thus hold the two frames from disengagement, while permitting the free rotation of the one upon the other. 'Between'the frames H and I is an annular space in which is located a grooved'insulator'member S secured to the memher I. Withinthe-groove of this insulator membar is a conductor band S which at one point is connected to an insulat d conductor S passing through the univer joint M andinto the lamp casing 11' to the bulb N, the opposite ter- '55 a S and is resiliently pressed against the contact strip S by a spring S within the tube 5 l The opposite end of the tube S is connected to the terminal end of the conductor R, an insulated portion R. of which passes through the universal joint G. S" is a screw threaded plug engaging a radially extending screw threaded aperture in the frame H in which the tubes S and S are inserted and which serves to hold the said parts in position.

' With the construction as just described the secondary current from the transformer P-will pass through the conductor R and the successive sections of the jointed arm to the tube S From this tube current is conducted through the spring S" and contact brush S to the strip S from which it passes through the conductor S to the lamp bulb N. If the switch 0 is closed the circuit will be completed'through said switch to the frame I and thence back through the metal of the arm to the transformer P. This circuit remains unchanged without regard to the position of'adjustment of the lamp casing L about the frame H or the angularity of any of the parts. Also, as the lens J functions the same in every position of relative adjustment of the frame I, the operator can adjust the lamp to the most favorable angle for illuminating the work and at the same time obtain an enlarged vision of the work through the lens.

The lens J is preferably'detachably mounted in the frame I by engaging the marginal portion thereof with a shoulder I and retaining it in this position by a snap ring I engaging a groove 1*.

Where the electrical service is D. C. current I dispense with the transformer and place within the hollow casing a suitable resistance for cutting down the voltage. Also, in place of grounding one figninal, two conductor wires are extended to the What I claim as my invention is:

1. In a device for simultaneously illuminating an object and affording magnified vision thereof, a lens, an annular frame-in which said lens is mounted, a lamp casing pivotally attached to said frame to be angularly adjustable relative thereto, an electric lamp in said casing, a second annular frame inwhich said lens frame is revolubly mounted, an adjustable support for said second frame, a conductor for conveying electric current through said adjustable support and second frame, and a ring and brush contact connection between said frames for supplying current from said conductor to said lamp in all positions of relative adjustment of said frames.

2. In a device for simultaneously illuminating an object and affording magnified vision thereof, a lens, an annular frame in which said-lens is mounted, a lamp casing pivotally attached to said frame to be angularly adjustable relative. thereto, an electric lamp in said casing, a second annular frame in which said lens frame is revolubly supported leaving an annular chamber therebetween, an insulator ring mounted on one of said ring supported by said insulator ring, a'contact brush having an insulator mounting in the other of saidannular frames and resiliently pressed against said conductor ring, an adjustable support for said second frame, and an insulated electrical conductor passing through said adjustable support and second frame and connected by said brush and ring contact to said lamp whereby current is supplied to said lamp in all positions of relativeadjustment of said frames.

3. In a device for simultaneously illuminating an object andafi'ording magnified vision thereof,

a lens, an annular frame in which sai lens is mounted, apost projectinglaterally from .said frame, a lamp casing universally pivoted upon said post, an electric lamp in said casing, a second annular frame in which said first frame is revolubly supported leaving an annular chamber therebetween, a grooved insulator ring connected to said first frame within said annular chamber, a conductor ring within the groove of said insulator ring electrically connected to one terminal of said lamp, an insulated conductor tube extending radially through said second frame, a contact pin slidable within said'tube and projecting into the groove in said insulator ring, a spring within said ,tube for pressing said contact pin against said said lamp in all positions of relative adjustment of said frames.

4. In adevice for simultaneously illuminating an object and affording magnified vision thereof, a lens, an annular frame in which said lens is mounted, a lamp casing pivotally attached to said frame to be angularly adjustable relative thereto, anelectr'ic lamp in said casing, a second annular frame in which said lens frame is revolubly mounted, a support for said second frame including a hollow casing and a jointed hollow arm projecting laterally therefrom, an electrical step-down transformer within said hollow casing having one terminal of the secondary coil thereof grounded on said casing, an insulated electrical conductor extending from the other secondary terminal through said jointed hollow arm to said second annular frame, and a ring and brush electrical connection located between said frames for conveying current from said insulated conductor to one terminal of said lamp the other terminal of Y which is grounded on said frame.

I a brush on said first frame cooperating'therewlth.

6. In a device for simultaneously illuminating an object and affording magnified vision thereof, a lens, an annular frame in which said lens is mounted, a lamp casing pivotally attached to said frame to be angularly adjustable relative thereto, a second annular frame in which said lens frame is revolubly mounted and means for conducting current .tosaid lamp concealed between said frames.

'7. In a device for simultaneously illuminating an objectand affording magnified vision thereof. a lens, an annular frame in'which said lens is mounted, a lamp pivotally attached to said aromas a frame to be angularly adjustable relative thereto, a second annular frame in which said lens frame isrevolubly mounted, a Jointed arm for adjusta'bly supporting said second frame, an electrical conductor carried by said jointed arm, and

means ior'transmitting current from said conductor to said lamp concealed between said frames.

8. In a device for simultaneously illuminating an object; and affording magnified vision there-,

of, a'r-lens, an annular frame in which said lens is mounted, a lamp casing pivotally attached to said frame to-be angularly adiustable relative thereto, a second annular frame in which said lens frame is revolubly mounted, a hollow jointed arm for adiustably supporting said second frame;

mounted, alamp casingpivotally attached to said jointedlarm. and means within said annular frames for completing electrical connection between saidconductor and lamp.

' CLEVOEJONES..

"frame to be angularly adjustable thereto, a second annular frame in which said lens frame is revolubly mounted. a hollow jointed .arm for ad-- iustabb supporting said second frame, an clectrical conductor passing through said hollow 

